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The Latticed Arch Under Bi-Directional Earthquake Excitations Simplified Procedure for Seismic Response Analysis of QU Yang, LUO Yongfeng, ZHU Zhaochen, HUANG Qinglong. J Shanghai Jiaotong Univ Sci, 2020, 25(6): 700-705.įixture Locating Modelling and Optimization Research of Aluminum Alloy Sidewall in a High-Speed Train Body Safety Evaluation Method for Long-Term Operation of Metro Based on Combination Weighting Method Journal of Shanghai Jiaotong University, 2020, 54(8): 873-880.ĬAO Weiwei, LI Mingguang, WU Wei, XIA Xiaohe, SHI Yujin.
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Test and Analysis of Deformation Characteristics of Deep Foundation Pit in Residual Soil Under Rainfall XIAO Zhaoyun, LI Mingguang, WANG Dafa, CHEN Jinjian. Selection of soil constitutive models for numerical analysis of deep excavations in close proximity to sensitive properties. Three-dimensional numerical analysis of braced excavation based on FLAC3D. Chinese Journal of Geotechnical Engineering, 2001, 23(5): 618-622. Parametric studies on behaviors of soil nailing. Ground movement analysis of soil nailing construction by three-dimensional (3-D) finite element modeling (FEM). Zhang Ming-ju, Song Er-xiang, Chen Zhao-yuan. Key words: deep ex cavat ion, soil nailing, fast Lagrangian analysis of continua in 3 dimensions (FLAC3D), three-dimensional nume rical analy sis, deformation, sliding surface The maximum axial force of soil nail appears near the middle and the relative minimum value near the two ends, and the distribution of maximum axial force agrees well with the potential sliding surface.
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The location of potential sliding surface can be indicated by shear strain increment contour, and the location moves toward the outside end of soil nail due to soil nail reinforcement effects. Tensile failure and shear failure are the two main failure modes of excavation slope. The results show that, the maximum lateral displacement appears close to slope toe, meanwhile, outside corner is the most disadvantageous location of deflection, and the multilevel platforms have positive effects on controlling soil deformation. The lateral displacement of excavation surface and outside soil, the shear strain increment of soil, and the axial force distribution of nail were analyzed. A unique linear relationship between the maximum shear force (thrust) and the maximum bending moment induced on the piles is obtained regardless of the ratios of the moving depth over the stable depth.In order to investigate the deformation characteristics and load transfer mechanism of deep excavation, a numerical model considering the process of stepped excavating and soil nailing was established by FLAC 3D. Typical results of the comparison between the FLAC3D analysis and the model tests for single piles in sand are presented in terms of three profiles namely: bending moment shear force and pile deflection profiles. In this paper three-dimensional finite difference analyses are reported: (1) to predict the results of two model tests (with and without axial load) and (2) to investigate the effect of the moving and the stable depths of soil on the pile response. Typical test results were analysed and reported previously. This issue has been investigated recently by conducting model tests on single piles and on pile groups with a new apparatus developed by the authors. The safety of the piled foundations depends on the additional stresses induced. Piles may be utilized as deep foundations or employed to support offshore structures, which may be subjected to passive loading due to lateral soil movements.